Science & Mathematics - 28 October 2007

Evaluate and compare delta y and dy.

y = 2x^2+1, x = 2, delta x = dx = 0.01

2007-10-28 14:10:09 · 1 answers · asked by topherpark67 1 in Mathematics

My assignment is to create a book to explain Newton's Laws of Motion so that a 4th grader could understand it.

2007-10-28 14:09:35 · 4 answers · asked by Anonymous in Physics

in case your wondering,I'm talking about the same foam rubber "cups" with sports logos or other stuff on it that people use to keep their beverage cold when tail gatting at big football games.

2007-10-28 14:08:31 · 1 answers · asked by Joe Cool 1 in Other - Science

2007-10-28 14:08:29 · 3 answers · asked by Maggie 1 in Biology

high enogh?




I'm only wondering about this so please don't be rude.

2007-10-28 14:06:12 · 2 answers · asked by Anonymous in Weather

2007-10-28 14:06:10 · 3 answers · asked by Anonymous in Biology

3 to the power of x+2 equals 7 to the power of 2x plus 5

2007-10-28 14:04:23 · 5 answers · asked by Best S 1 in Mathematics

2007-10-28 14:01:59 · 1 answers · asked by lilgirl_96541 1 in Earth Sciences & Geology

http://images.google.com/imgres?imgurl=http://www.astrologyweekly.com/zodiac-pictures/constellation/cancer20.jpg&imgrefurl=http://www.astrologyweekly.com/zodiac-pictures/zodiac-cancer-pictures.php&h=340&w=340&sz=4&hl=en&start=1&um=1&tbnid=kBsaN_IKshPLNM:&tbnh=119&tbnw=119&prev=/images%3Fq%3DCancer%2BConstellation%26svnum%3D10%26um%3D1%26hl%3Den%26client%3Dsafari%26rls%3Den%26sa%3DX

St this website there is a picture of the constellation Cancer the Crab. Could somebody tell me which star is which?

2007-10-28 14:01:46 · 2 answers · asked by Anonymous in Astronomy & Space

Why do chemists tak the rate of reactions near the beginning of a reaction?

2007-10-28 13:59:57 · 1 answers · asked by Anonymous in Chemistry

lot of detail please

2007-10-28 13:59:10 · 4 answers · asked by himo9294 1 in Botany

Ok I'm having my GCE O levels examination in like 5 hours, so reaaaally need help on this question.

The force of attraction between two magnets if F Newtons. This force is inversely proportional to the square of the distance, D centimetres, between the magnets.

When the magnets are a certain distance apart, the forcce is 10 Newtons. What is the force when this distance is doubled?

2007-10-28 13:57:57 · 1 answers · asked by sarahajane 2 in Mathematics

In the fluid mosaic model, what do the peripheral proteins do? What are the carbohydrates used for, is chloseterol used for anything? and what are the microfilaments of the cytoskeleton used for?

2007-10-28 13:57:41 · 1 answers · asked by Anonymous in Biology

Hey - I'm trying to use state diagrams to design a digital circuit. Quick question: If I have 2 inputs and 3 outputs, how many variables do I need on my Karnaugh maps?

I don't get it! Can anyone explain? Thanks

2007-10-28 13:56:56 · 1 answers · asked by AlaskaGirl 4 in Engineering

2007-10-28 13:53:21 · 5 answers · asked by Anonymous in Biology

Need answer asap

2007-10-28 13:50:59 · 2 answers · asked by l_towns_finest1 1 in Botany

I know that the temperatures stop falling at the freezing point because the energy of the heat of fusion must be taken away (the liquid must turn solid or vice versa) before the temperature falls again, but exactly why? also, howabout the melting point? the temperature stops rising there too, why?

2007-10-28 13:50:57 · 5 answers · asked by SnowAngel123 2 in Weather

a- to keep cell size small as multicellular organisms grow
b- to make more organisms in single-celled organisms
c- to make more cell in a multicellular organism
d- All of above are functions of cell division.

2007-10-28 13:50:47 · 3 answers · asked by dreams 2 in Biology

2007-10-28 13:50:00 · 2 answers · asked by piinkpolkadots 1 in Physics

specific heat capacity of water is 4.18 J/g*C, molar mass of NaOH is 40 g/mol, molar mass of water is 18 g/mol
the formula for molar enthapy is Q/mol.
the formula for Q is mass* change in temp*specific heat capacity.

2007-10-28 13:49:38 · 2 answers · asked by valentina 1 in Chemistry

I understand how to solve simpler ones. But i dont get what top do when i have squared terms.

3x²-y²=9
x²+2y²=10

x²+y²=25
9y=4x²

how do i solve these?

(to make a square, press ALT + 0178)

2007-10-28 13:46:41 · 6 answers · asked by Anonymous in Mathematics

A proud new Honda owner drivers her car at a speed of 25 m/s into a corner. The coefficients of friction between the road and the tires are 0.70 (static) and 0.40(kinetic). What is the minimum radius of curvature for the corner in order for the car not to skid?

2007-10-28 13:45:33 · 1 answers · asked by korr 2 in Physics

f(x) = 2x^2 - 7x + 2

2007-10-28 13:44:11 · 6 answers · asked by Epic M 1 in Mathematics

Answertariat:

Why can glider's glide with minimal altitude loss?

Here is my flawed reasoning for why they cannot!
Lets say we have a glider that weights 100kg flying through the air at a speed of 10m/s. Traveling at this speed, it generates a lift of ~1 kN (F = mg so it stays at constant altitude). The kinetic energy of the glider is 5kJ. Without energy entering the system, the kinetic energy should be converted into lifting force. By this reasoning, the glider should reach zero velocity in just a few meters.

Basically, it seems like the force required to keep a plane in the air is less than the force driving it at a constant velocity.

2007-10-28 13:43:23 · 2 answers · asked by TSSA! 3 in Physics

Can I get a short summary on the Greenhouse Effect.

2007-10-28 13:43:20 · 1 answers · asked by Anonymous in Biology

I need to calculate the vapour pressure of of water in an experiment I have done for chemistry, and all I have is the tempurature of the water in the particular flask that I am calculating the pressure for, but I don't know how to go about calculating it in terms of Torr.

2007-10-28 13:42:28 · 1 answers · asked by Jaclyn 1 in Chemistry

Most animals use mostly fat/lard to store energy, and plants use oil (i.e. corn oil), but arctic animals have more oil.

2007-10-28 13:42:24 · 2 answers · asked by Anonymous in Biology

2007-10-28 13:39:21 · 2 answers · asked by dreams 2 in Biology

I have to calculate the concentration of the NaOH solution I used in a titration lab from my data. So my volume was 0.02830L and the amount of moles was 0.1025mol. Then I divided the moles over litres to get 3.6mol/l. But in the titration it was the volume of NaOH used to titrate 10.00ml of 0.15M H2C2O4 so now I'm confused because it took 28.30mL to titrate the oxalic acid. Would I have to include the other amounts (10.00ml of 0.15M H2C2O4) and if yes how would I do that?

2007-10-28 13:31:49 · 1 answers · asked by <3DA<3 1 in Chemistry

What type of chlorophyll does the reaction center contain? What are the roles of the other pigments?

2007-10-28 13:30:47 · 1 answers · asked by Anonymous in Biology